X-Git-Url: https://git.sesse.net/?p=nageru;a=blobdiff_plain;f=timebase.h;h=dbc4402c1820d454528bd952feeb7c90ef1b8dd2;hp=be2362b2ef7d376222564ccb81d09fa557aea6b5;hb=refs%2Fheads%2Fffmpeg-audio-only;hpb=b0709b4804bd61571bb804d52cfa9e34fad14fb6

diff --git a/timebase.h b/timebase.h
index be2362b..dbc4402 100644
--- a/timebase.h
+++ b/timebase.h
@@ -4,14 +4,22 @@
 // Common timebase that allows us to represent one frame exactly in all the
 // relevant frame rates:
 //
-//   Timebase:              1/60000
-//   Frame at 50fps:     1200/60000
-//   Frame at 60fps:     1000/60000
-//   Frame at 59.94fps:  1001/60000
+//   Timebase:                1/120000
+//   Frame at 50fps:       2400/120000
+//   Frame at 60fps:       2000/120000
+//   Frame at 59.94fps:    2002/120000
+//   Frame at 23.976fps:   5005/120000
 //
 // If we also wanted to represent one sample at 48000 Hz, we'd need
 // to go to 300000. Also supporting one sample at 44100 Hz would mean
 // going to 44100000; probably a bit excessive.
-#define TIMEBASE 60000
+#define TIMEBASE 120000
+
+// Some muxes, like MP4 (or at least avformat's implementation of it),
+// are not too fond of values above 2^31. At timebase 120000, that's only
+// about five hours or so, so we define a coarser timebase that doesn't
+// get 59.94 precisely (so there will be a marginal amount of pts jitter),
+// but can do at least 50 and 60 precisely, and months of streaming.
+#define COARSE_TIMEBASE 300
 
 #endif  // !defined(_TIMEBASE_H)